Southern Red River Valley, Minnesota, including: all of Norman, Clay, and Wilkin counties, western portions of Mahnomen, Becker, and Otter Tail counties; part of northern Traverse County, and part of northwestern Grant County. This is the area of Minnesota within USGS 1:100,000 scale tile-sheets 1910 (Ada), 2310 (Fargo), and 2710 (Wahpeton).

Users may wish to verify critical information; sources include both the references here and information on file in the offices of the Minnesota Geological Survey and the Department of Natural Resources. Every effort has been made to ensure the interpretation shown conforms to sound geologic and cartographic principles. This map should not be used to establish legal title, boundaries, or locations of improvements.

Contact Person

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Browse Graphic File Name

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Associated Data Sets

Southern Red River Valley Regional Hydrogeologic Assessment, Part A - Produced by the Minnesota Geological Survey

Section 2

Data Quality Information

Attribute Accuracy

Logical Consistency

Data are topologically correct using ARC/INFO 7.0.3

Completeness

Complete

Horizontal Positional Accuracy

N.A.

Vertical Positional Accuracy

N.A.

Lineage

A variety of data was used to compile an Excel file called addlpts.xls:

a) water table elevations from wells completed in surficial aquifers

b) surface water elevations (lakes and rivers)

c) calculated water table elevations from well logs

Points developed using a) and b) include both measured and other data. The sources of other data for a) are historic measurements from CWI and USGS reports. The source of other data for b) is elevation computed from topographic maps. Calculated water table elevations - c) - were used west of the Beach Ridges. The water table elevation was assumed to occur at the interface of the oxidized (yellow or red geologic materials) and reduced (blue) zones in CWI well logs. The data were carefully screened and data points which seemed inconsistent or were difficult to interpret were deleted. The reason for this measurement was that there were no surface water or surficial water table control points within the lake plain, making this the most suitable alternative for calculating water table elevations. The data was compiled by Mike Trojan.

The Excel file was converted to an ARC/INFO point coverage using the following method:

Two comma separated value files were created, one with only the following three fields: the unique number and x and y coordinates, the other with all fields

In ARC, the 'generate' command converted the first comma separated value file into a simple point coverage.

In INFO, a data file was created from the second comma separated value file, the one containing all fields..

The ARC command, 'joinitem' connected the point coverage with the INFO data file, using the unique number as the relate id.

Source Scale Denominator

200,000

Section 3

Spatial Data Organization Information

Native Data Set Environment

ARC/INFO

Geographic Reference for Tabular Data

Meters in the ALBERS projection

Spatial Object Type

Vector

Vendor Specific Object Types

Points

Tiling Scheme

The area of Minnesota within USGS 1:100,000 scale tile-sheets 1910 (Ada), 2310 (Fargo), and 2710 (Wahpeton).

Section 4

Spatial Reference Information

Horizontal Coordinate Scheme

UTM

Ellipsoid

GRS 1980

Horizontal Datum

NAD83

Horizontal Units

Meters

Altitude Datum

N.A.

Altitude Units

N.A.

Depth Datum

N.A.

Depth Units

N.A.

Cell Width

N.A.

Cell Height

N.A.

Section 5

Entity and Attribute Information

Entity and Attribute Overview

Entity and Attribute Detailed Citation

Table Name

Field Name

Begin Column

Definition

Valid Values

Description

WTELPT.PAT

Arc Attribute Table

seq#

17

6,6,i

A unique identifier

utmx

23

6,6,i

UTM Easting in meters

utmy

29

7,7,i

UTM Northing in meters

uniq#

36

6,6,c

Unique well number

swel

48

4,4,i

Static water level elevation in feet

elev

52

4,4,i

Surface elevation in feet

depth_to_water

56

2,2,i

Depth to water in feet

Section 6

Distribution Information

Publisher

Minnesota Department of Natural Resources, Division of Waters

Publication Date

2000

Online Linkage

Distributor Contact Person

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Distribution Liability

This map was prepared from publicly available information only. Every reasonable effort has been made to ensure the accuracy of the factual data on which this map is based. However, the Department of Natural Resources does not warrant the accuracy, completeness, or any implied uses of these data.

Users may wish to verify critical information; sources include both the references here and information on file in the offices of the Minnesota Geological Survey and the Department of Natural Resources. Every effort has been made to ensure the interpretation shown conforms to sound geologic and cartographic principles. This map should not be used to establish legal title, boundaries, or locations of improvements.